Ethylene/Propylene Glycol Refractometer, Hand Held; Propylene/Ethylene Glycol, Range -60 Degrees F to 32 Degrees F, 1.15 to 1.30 specific gravity, Automatic Temperature Compensation Yes, Accuracy +/-2 Percent, Resolution 2 Degrees F, Function Measure the Freezing Point of Polyproylene and Ethylene Glycol and Battery Acid Specific Gravity, Specific Gravity 1.15 to 1.30, Freezing Point -60 to 25 Degrees F Propylene, -60 to 32 Degrees F Ethylene